Display panel or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with transitional graphical user interface showing a first image in a sequence of my design; and,

FIG. 2 is a front view of a display panel or portion thereof with transitional graphical user interface showing a second image in the sequence thereof.

The subject matter of the present disclosure includes a process or period during which one computer graphical user interface component changes into another. This process or period in which one computer graphical user interface component transitions into another computer graphical user interface component forms no part of the claimed design.

The outermost broken line rectangle illustrates a display panel or portion thereof that forms no part of the claimed design. The remaining broken lines, including all text, illustrate portions of the graphical user interface, and form no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with transitional graphical user interface, as shown and described. 